The results of this study in 172 patients without diabetes who underwent elective stent implantation showed a significant correlation between preprocedural fasting insulin serum levels and angiographic late lumen loss (correlation coefficient 0.49, p <0.0001). Furthermore, the waist-to-hip ratio and C-peptide and hemoglobin A1c serum levels were associated with the occurrence of binary angiographic restenosis.